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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c9d7c8f16328598d642e6910c741791079d85ce64ef53099e39dd5890054238' 
  AND token = 'lj6A41d/hUO7JKFIPli1lif5mePJ8NMzH5IIOiBdzao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}